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How to insert a newline in front of a pattern?
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This works in bash and zsh, tested on Linux and OS X:
sed 's/regexp/\'$'\n/g'
In general, for $ followed by a string literal in single quotes bash performs C-style backslash substitution, e.g. $'\t' is translated to a literal tab. Plus, sed wants your newline literal to be escaped with...
Using Rails serialize to save hash to database
I'm try to save a hash mapping ids to a number of attempts in my rails app. My migration to the database to accommodate this new column:
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Commenting in a Bash script inside a multiline command
How can I comment on each line of the following lines from a script?
7 Answers
7
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How to pick a new color for each plotted line within a figure in matplotlib?
...fy a color for each plotted line, and have each line get a distinct color. But if I run:
7 Answers
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Python string.replace regular expression [duplicate]
...r.replace() v2|v3 does not recognize regular expressions.
To perform a substitution using a regular expression, use re.sub() v2|v3.
For example:
import re
line = re.sub(
r"(?i)^.*interfaceOpDataFile.*$",
"interfaceOpDataFile %s" % fileIn,
line
)
In a ...
Linux command to print directory structure in the form of a tree
...sh script that will print the directory structure in the form of a tree, e.g.,
7 Answers
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Nested function in C
... declare a function inside of a function, but it's not a nested function.
gcc has a language extension that allows nested functions. They are nonstandard, and as such are entirely compiler-dependent.
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Remove commas from the string using JavaScript
I want to remove commas from the string and calculate those amount using JavaScript.
2 Answers
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C++: What is the size of an object of an empty class?
I was wondering what could be the size of an object of an empty class . It surely could not be 0 bytes since it should be possible to reference and point to it like any other object. But, how big is such an object?
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How to initialize a dict with keys from a list and empty value in Python?
...keys([1, 2, 3, 4])
This is actually a classmethod, so it works for dict-subclasses (like collections.defaultdict) as well. The optional second argument specifies the value to use for the keys (defaults to None.)
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